Some call it hubris; others call it cool reason. But the idea that we might combat global warming by deliberately
engineering a cooler climate – for instance, by constructing some kind of planetary sunshade – has lately migrated from the
fringe to the scientific mainstream. We are already modifying climate by accident, say proponents of geoengineering; why not
do something intentional and intelligent to stop it? Hold on, say critics. Global warming shows we understand the Earth too
little to engineer it without intended and possibly disastrous consequences. Both sides worry that facts on the ground – rising
seas, melting ice, failing crops – may cut short the geoengineering debate.
【題組】44. What is the main idea of this passage?
(A) Geoengineers are taking the step to build a large sun-shade.
(B) We do not have much time for geoengineering debate.
(C) The debate over whether humans can possibly take control over climate change.
(D) Global warming can be monitored.
(E) Planetary sunshade construction is a cutting-edge technology.
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